Premium Member

Google has sent out an email this morning that says in part: "Starting on June 27th, 2015, SMS notifications from Google Calendar will no longer be sent. SMS notifications launched before smartphones were available. Now, in a world with smartphones and notifications, you can get richer, more reliable experience on your mobile device, even offline."

I don't know about more reliable, and yes there are other choices. Personally, I relied on getting that SMS, and understand there will be a huge cost savings for Google.